Problem with custom failure message in parser combinator library

[scabug]

Not able to generate a custom failure message in the parser combinator library. For a rule like ..

def buy_sell: Parser[BuySell] =
  "to" ~> "buy" ^^^ BUY      |
  "to" ~> "sell" ^^^ SELL     |
  failure("buy or sell expected")

If the input has something (say "bought") other than "buy" or "sell", then the message that gets printed is the default one ..

``sell_ expected but identifier bought found

The main parse call is like the following :-

val str = //.. the string to parse
val tokens = new lexical.Scanner(str)
phrase(order)(tokens) match {
  case Success(order, _) =>
    println(order)
  case Failure(msg, _) => println("Failure: " + msg)
  case Error(msg, _) => println("Error: " + msg)
}

I posted this to scala-user and Martin Odersky responded here - [http://thread.gmane.org/gmane.comp.lang.scala.user/24426/focus=24510] and asked to file a ticket.

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-3212?orig=1
Reporter: Debasish Ghosh (debasishg)

[scabug]

@SethTisue said:
The parser combinators library is now community-maintained. Issues with it are now tracked at scala/scala-parser-combinators#61 instead of here in the Scala JIRA.

Interested community members: if you consider this issue significant, feel free to open a new issue for it on GitHub, with links in both directions.